Novel is a literary genre that focuses on portraying characters and reflects social life through the narrative of complete stories and the description of profound environment. It is a literary work with complete layout, reasonable development and aesthetic principles running through the theme.
Poetry is the oldest and most basic literary form in the world, and it is a literary genre that expounds the soul. Poets need to master mature artistic skills and express social life and human spiritual world with concise language, rich emotions and rich images according to certain requirements of syllables, tones and rhythms.
Prose is prose that does not pay attention to rhythm, including essays, essays, travel notes and so on. It is the freest style, without paying attention to phonemes, parallelism and any restrictions. It is also the earliest style of writing in China. Usually, an article has one or more central ideas, which are expressed by lyric, narrative and logical means.
American writing is just a kind of prose and a form of prose writing.
Don't say whether your composition is a real novel, but you can understand what the teacher means. What the teacher means is that your writing has no focus and no central idea, that is, prose should be written around the central idea, otherwise it is not an article, but prose. Try to think about how this sentence can reflect the center of your article, or how to set off the center, and think about it when writing. Also, read more good articles, don't always stare at online literature, you can't see anything helpful, believe me.